jsp登录注册代码（增删改查+网页+数据库）

本文介绍: reg i ste r.jsp:注册 doreg i s t e r.jsp:注册信息弹框 login.js p:登录 dologin.js p：与数据库相连、存放登陆的用户 index.js p:主界面 update.js p:修改 doup.js p:修改页面（帮助）info.js p：详情dodel.js p:删除界面

一·登录注册代码以及效果

doregister.jsp:注册信息弹框

dologin.jsp：与数据库相连、存放登陆的用户

一·登录注册代码以及效果

regis t e r.js p:注册

&lt;%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%&gt;
&lt;!DOCTYPE html&gt;
<html&gt;
<head&gt;
<meta charset="UTF-8">
<title>注册</title>
<style>
 #a {
    width:50%;
    height:200px;
    border: 1px dashed ;
    background-color:lightyellow;
    text-align:center;
}
body{
background-color:lightblue;
}
</style>
</head>
<body>
	<form action="doregister.jsp" method="post">
		用户名:<input type="text" name="uname"><br>
		密码:<input type="password" name="upwd"><br>
		备注:<textarea rows="" cols="" name="uinfo">
		</textarea><br>
		<input type="submit" value="注册">
		<input type="reset" value="重置">
	</form>
</body>
</html>

doregister.jsp:注册 信息弹框

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//设置编码-设置请求对象的编号
	request.setCharacterEncoding("utf-8");
	//接收注册页面传递的数据
	String uname = request.getParameter("uname");
	String upwd = request.getParameter("upwd");
	String uinfo = request.getParameter("uinfo");
	//连接数据库
	Class.forName("oracle.jdbc.driver.OracleDriver");
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	/*
	查询到用户的最大编号
	最大编号+1，做为新添加的用户的编号
	*/

	//这里的代码是用来 得到最新编号的
	int nextId=1;//做为新用户的编号
	PreparedStatement ps = con.prepareStatement("select max(uuid) from T277");
	//执行sql语句
	ResultSet rs= ps.executeQuery();
	if(rs.next()){
		//查询到最大的编号，加1，就是新数据的编号
		nextId = rs.getInt(1)+1;
	}
	
	//这里的代码 开始执行添加用户操作
	ps = con.prepareStatement("insert into T277 values(?,?,?,?)");
	ps.setInt(1, nextId);
	ps.setString(2, uname);
	ps.setString(3, upwd);
	ps.setString(4, uinfo);
	//执行sql语句
	int i = ps.executeUpdate();
	if(i>0){
		out.print("<script>alert('注册成功');location.href='login.jsp'</script>");
	}else{
		out.print("<script>alert('注册失败');location.href='register.jsp'</script>");
	}
		
	
%>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录</title>
<style>
 #a {
    width:50%;
    height:200px;
    border: 1px dashed ;
    background-color:lightyellow;
    text-align:center;
}
body{
background-color:lightblue;
}
</style>
</head>
<body>
	<form action="dologin.jsp">
		用户名：<input type="text" name="uname"><br>
		密码:<input type="password" name="upwd"><br>
		<input type="submit" value="登录">
		<input type="button" value="注册" onclick="javascript:location.href='register.jsp'">		
	</form>
</body>
</html>

dologin.jsp：与数据库相连、存放 登陆的用户

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//接收login页面传递的数据
	String uname = request.getParameter("uname");
	String upwd = request.getParameter("upwd");
	//连接数据库
	//注册驱动类
	//OracleDriver
	Class.forName("oracle.jdbc.driver.OracleDriver");
	//连接数据库
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	//创建对象
	PreparedStatement ps = con.prepareStatement("select * from T277 where uname=? and upwd=?");
	//给占位符赋值
	ps.setString(1, uname);
	ps.setString(2, upwd);
	//执行sql语句
	ResultSet rs = ps.executeQuery();
	//处理结果
	if(rs.next()){
		//转发
		request.getRequestDispatcher("index.jsp").forward(request, response);
	}else{
		//失败
				out.print("<script>alert('用户名或密码错误，请重新登录');location.href='login.jsp'</script>");
	}
	//关闭连接
%>

index.jsp:主界面

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>主页面</title>
<style>
 #a {
    width:50%;
    height:200px;
    border: 1px dashed ;
    background-color:lightyellow;
    text-align:center;
}
body{
background-color:lightblue;
}
</style>
</head>
<body>
	<table border="1" align="center" width="80%">
		<tr>
			<td>编号</td>
			<td>用户名</td>
			<td>密码</td>
			<td>备注</td>
			<td>操作</td>
		</tr>
		<%
		//连接数据库 进行查询所有数据
		//注册驱动类
		Class.forName("oracle.jdbc.driver.OracleDriver");
		//连接数据库
		String url = "jdbc:oracle:thin:@localhost:1521:orcl";
		Connection con = DriverManager.getConnection(url, "scott", "tiger");
		//创建Pre对象
		PreparedStatement ps = con.prepareStatement("select * from T277 order by uuid");
		//执行sql语句
		ResultSet rs = ps.executeQuery();
		//处理结果-遍历结果集
		while(rs.next()){
		%>
			<tr align="center">
				<td><%=rs.getInt(1) %></td>
				<td><%=rs.getString("uname") %></td>
				<td><%=rs.getString("upwd") %></td>
				<td><%=rs.getString(4) %></td>
				<td>
					<a href="doup.jsp?uuid=<%=rs.getInt(1)%>">修改</a>
					<a href="info.jsp?uuid=<%=rs.getInt(1)%>">详情</a>
					<a href="dodel.jsp?uuid=<%=rs.getInt(1)%>">删除</a>
				</td>
			</tr>
			<%} %>
	</table>
</body>
</html>

update.jsp:修改

<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//设置编码-设置请求对象的编号
	request.setCharacterEncoding("utf-8");
	//接收修改页面传递的数据
	String uname = request.getParameter("uname");
	String upwd = request.getParameter("upwd");
	String uinfo = request.getParameter("uinfo");
	//获取要修改的用户编号
	String id = request.getParameter("uuid");
	//把字符串转换为整数编号
	int uuid = Integer.valueOf(id);
	//JDBC 删除  
	Class.forName("oracle.jdbc.driver.OracleDriver");
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	PreparedStatement ps = con.prepareStatement("update T277 set uname=?,upwd=?, uinfo=? where uuid="+uuid);
	ps.setString(1, uname);
	ps.setString(2, upwd);
	ps.setString(3, uinfo);
	int i = ps.executeUpdate();
	if(i>0){
		out.print("<script>alert('修改成功');location.href='index.jsp'</script>");
	}else{
		out.print("<script>alert('修改失败');location.href='index.jsp'</script>");
	}
%>

doup.jsp:修改页面（帮助）

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
	//获取要修改的用户编号
	String id = request.getParameter("uuid");
	//把字符串转换为整数编号
	int uuid = Integer.valueOf(id);
	%>
	<form action="update.jsp?uuid=<%=uuid %>" method="post">
		用户名:<input type="text" name="uname"><br>
		密码:<input type="password" name="upwd"><br>
		备注:<textarea rows="" cols="" name="uinfo">
		
		</textarea><br>
		<input type="submit" value="修改">
		<input type="reset" value="重置">
	</form>
</body>
</html>

info.jsp：详情

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//获取要修改的用户编号
	String id = request.getParameter("uuid");
	//把字符串转换为整数编号
	int uuid = Integer.valueOf(id);
	//JDBC 删除
	Class.forName("oracle.jdbc.driver.OracleDriver");
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	PreparedStatement ps = con.prepareStatement("select * from T277 where uuid="+uuid);
	ResultSet rs= ps.executeQuery();
	if(rs.next()){
			%>
		<form>
			用户名:<input type="text" name="uname" value="<%=rs.getString("uname") %>"><br>
			密码:<input type="password" name="upwd" value="<%=rs.getString("upwd") %>"><br>
			备注:<textarea rows="" cols="" name="uinfo" >
			<%=rs.getString(4) %>
			</textarea><br>
			<a href="index.jsp">返回</a>
		</form>
		<%} %>

dodel.jsp:删除界面

<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//获取要删除的用户编号
	String id = request.getParameter("uuid");
	//把字符串转换为整数编号
	int uuid = Integer.valueOf(id);
	//JDBC 删除
	Class.forName("oracle.jdbc.driver.OracleDriver");
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	PreparedStatement ps = con.prepareStatement("delete T277 where uuid="+uuid);
	int i = ps.executeUpdate();
	if(i>0){
		out.print("<script>alert('删除成功');location.href='index.jsp'</script>");
	}else{
		out.print("<script>alert('删除失败');location.href='index.jsp'</script>");
	}
	
	
%>

二·页面跳转的方式以及他们的区别

1、跳转 路径并传递数据

 //假设法：假设我的用户名为admin 密码为123
    if("admin".equals(name)&amp;&amp;"123".equals(pwd)){
        //说明登录成功 跳转到success.jsp
//1.重定向 将页面跳转 地址栏发生了改变
        //不能将值传递到下一个界面  可以跳转到任意资源  在客户端发挥作用
        response.sendRedirect("http://www.baidu.com");
//2.转发 将页面跳转 可以将值传递到下一个界面 
        //但是地址栏不发生改变 而是停留在了之前的页面 只能转发到当前项目内资源 在服务器端发挥作用
        //request.getRequestDispatcher("http://www.baidu.com").forward(request, response);
    }
    else{
        //说明登录失败 提示用户并返回登录界面login.jsp js的跳转属于重定向 地址栏发生了改变 login-->dologin-->login
        out.print("<script>alert('用户名或者密码有误');location.href='login.jsp';</script>");
    }

2、页面跳转的两种方式和区别

重定向：地址栏发生改变不能传值可以跳转到任意资源在客户端发挥作用
转发：地址栏不发生改变能传值只能跳转到当前项目内资源在服务器端发挥作用

语法：
重定向：response.sendR()

转发：request.getreq .for(request,response)

三·其他

1、jdbc连接Oracle

URL:jdbc:oracle:thin:@localhost:1521:orcl

2、乱码

request.setCharacterEncoding("utf-8");

3、添加 数据时，获取最新编号

//这里的代码是用来 得到最新编号的   
    int nextId=1;//做为新用户的编号
    PreparedStatement ps = con.prepareStatement("select max(uuid) from T277");
    //执行sql语句
    ResultSet rs= ps.executeQuery();
    if(rs.next()){
        //查询到最大的编号，加1，就是新数据的编号
        nextId = rs.getInt(1)+1;
    }